The O.S. Speed 21XZ-B Spec II "Ty 110%" .21 Engine was developed in collaboration with renowned factory driver Ty Tessmann. The Speed 21XZ-B Spec. II Ty 110% features improvements that paved the way for Ty to take first place in the Nitro Truggy division at the ROAR Fuel Off-Road National Championships you can be confident that it makes all the power you need! This model comes with a T-2090SC exhaust pipe and manifold that offers lots of tuning options. The Speed 21XZ-B Spec. II Ty 110% is being produced in limited quantities, so get yours before they are gone!